Yes you can but you'll want to change the air filter cover also because it is taller to. Also want to change the handle bar. The saws are the same except for these 3 parts and the P/C and mufflers. All ignition parts will change also.

All the 306 tin mufflers always seemed to have a smaller exit than a 245 but I never gave it a whole lot of thought.

I've often thought about putting the 306 cast muffler on a 245 to see what that thing would sound like if it would fit.:monkey:

Nope tin mufflers the same. Yes the cast muffler will fit and sound mostly like a 306! In fact the earlier 200 series 4.5ci saws like the 220-223 came with that cast muffler and they can be mistaken for a 245.